138808133 has 2 divisors, whose sum is σ = 138808134. Its totient is φ = 138808132.

The previous prime is 138808073. The next prime is 138808141. The reversal of 138808133 is 331808831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114532804 + 24275329 = 10702^2 + 4927^2 .

It is a cyclic number.

It is not a de Polignac number, because 138808133 - 2⁶ = 138808069 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138808093 and 138808102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138808193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69404066 + 69404067.

It is an arithmetic number, because the mean of its divisors is an integer number (69404067).

Almost surely, 2^138808133 is an apocalyptic number.

It is an amenable number.

138808133 is a deficient number, since it is larger than the sum of its proper divisors (1).

138808133 is an equidigital number, since it uses as much as digits as its factorization.

138808133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 138808133 is about 11781.6863393998. The cubic root of 138808133 is about 517.7716939369.

The spelling of 138808133 in words is "one hundred thirty-eight million, eight hundred eight thousand, one hundred thirty-three".